INDIANA -- Indiana sex offenders challenged a federal ruling that bans them from social media sites.

The judge defends her decision, saying that social media networking sites are a virtual playground for sexual predators.

However, the ACLU said it's a violation of the First Amendment.

Lawyers argue that because sex offenders are not allowed on Twitter and Facebook, they cannot contact political and religious leaders.

"The main plaintiff has custody of a young son who is beginning to use social media. He wants to be able to supervise it. He can't do that. For many people, this is a major, major, incursion on their ability to communicate," said Ken Falk, ACLU Legal Director.

Critics argue there are many ways to contact people without using social media.